General Resources:
Marty Cagan’s blog: He's the author of the ubiquitous book, Inspired, but even just reading his blog is useful.
Mind the Product blog: A London-based group that has great practical articles on all aspects of product mgmt and software building.
Product Collective: Also has a great Slack group.
List of PM resources with templates: https://medium.com/infinitypm/a-living-list-of-product-management-resources-youll-want-to-bookmark-c80b45aa1026
Brandon Chu: Experienced PM who's also done other roles; says some controversial but valid things.
Articles:
Velocity: The Often-Overlooked Secret to Product Manager Success: Talks about velocity in more general terms, not just about counting points. Excerpt:
Okay — how do I address underlying velocity issues?
Are they empowered to deliver in their swim lane?
Do they have an understanding of why their work matters?
Are they operating in a psychologically safe environment?
Do they have a structured process for continuous improvement?
The magic of focusing on velocity is that once the team is moving faster and delivering more, many of the problems that people were complaining about will go away on their own or will naturally improve as part of the velocity increasing process. You will get the result you want by focusing on the cause, not the symptoms. You will solve productivity problems by enabling the team to do well and by taking care of them, not by blaming them or demotivating them.
Books
Product
Mary Cagan (newer edition): INSPIRED: How to Create Tech Products Customers Love
Melissa Perri - Escaping the Build Trap
Badass: Making Users Awesome by Kathy Sierra
Management
Radical Candor: Be a Kick-Ass Boss Without Losing Your Humanity
Product Roadmaps Relaunched: How to set directions while embracing uncertainty
Switch: Change when change is hard by Dan Heath, Chip Heath
The Hard Thing About Hard Things: Building a Business When There Are No Easy Answers by Ben Horowittz
Communication
Swayed: How to Communicate for Impact